When you shade, try to think of an interesting light source and shade with that in mind, instead of just putting the shadows around the outline. What you've done is called "pillow shading" and it doesn't look very good, and damages the readability of your artwork. For example, I can't tell if the torso is meant to be fat and round, or flat, or what the form of the legs is, or where the ears are on the head (depth-wise). All of these things would be much easier to show if you chose a consistent light source and shaded according to what that light source would light up and what it would not.
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When you shade, try to think of an interesting light source and shade with that in mind, instead of just putting the shadows around the outline. What you've done is called "pillow shading" and it doesn't look very good, and damages the readability of your artwork. For example, I can't tell if the torso is meant to be fat and round, or flat, or what the form of the legs is, or where the ears are on the head (depth-wise). All of these things would be much easier to show if you chose a consistent light source and shaded according to what that light source would light up and what it would not.